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/
miningpool.go
133 lines (112 loc) · 3.09 KB
/
miningpool.go
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package miningpool
import (
"errors"
"sync"
"time"
log "github.com/sirupsen/logrus"
"github.com/bytom/bytom/account"
"github.com/bytom/bytom/event"
"github.com/bytom/bytom/mining"
"github.com/bytom/bytom/protocol"
"github.com/bytom/bytom/protocol/bc/types"
)
const (
maxSubmitChSize = 50
)
type submitBlockMsg struct {
blockHeader *types.BlockHeader
reply chan error
}
// MiningPool is the support struct for p2p mine pool
type MiningPool struct {
mutex sync.RWMutex
block *types.Block
submitCh chan *submitBlockMsg
chain *protocol.Chain
accountManager *account.Manager
txPool *protocol.TxPool
eventDispatcher *event.Dispatcher
}
// NewMiningPool will create a new MiningPool
func NewMiningPool(c *protocol.Chain, accountManager *account.Manager, txPool *protocol.TxPool, dispatcher *event.Dispatcher) *MiningPool {
m := &MiningPool{
submitCh: make(chan *submitBlockMsg, maxSubmitChSize),
chain: c,
accountManager: accountManager,
txPool: txPool,
eventDispatcher: dispatcher,
}
m.generateBlock()
go m.blockUpdater()
return m
}
// blockUpdater is the goroutine for keep update mining block
func (m *MiningPool) blockUpdater() {
for {
select {
case <-m.chain.BlockWaiter(m.chain.BestBlockHeight() + 1):
m.generateBlock()
case submitMsg := <-m.submitCh:
err := m.submitWork(submitMsg.blockHeader)
if err == nil {
m.generateBlock()
}
submitMsg.reply <- err
}
}
}
// generateBlock generates a block template to mine
func (m *MiningPool) generateBlock() {
m.mutex.Lock()
defer m.mutex.Unlock()
block, err := mining.NewBlockTemplate(m.chain, m.txPool, m.accountManager)
if err != nil {
log.Errorf("miningpool: failed on create NewBlockTemplate: %v", err)
return
}
m.block = block
}
// GetWork will return a block header for p2p mining
func (m *MiningPool) GetWork() (*types.BlockHeader, error) {
if m.block != nil {
m.mutex.RLock()
defer m.mutex.RUnlock()
m.block.BlockHeader.Timestamp = uint64(time.Now().Unix())
bh := m.block.BlockHeader
return &bh, nil
}
return nil, errors.New("no block is ready for mining")
}
// SubmitWork will try to submit the result to the blockchain
func (m *MiningPool) SubmitWork(bh *types.BlockHeader) error {
if bh == nil {
return errors.New("can't submit empty block")
}
reply := make(chan error, 1)
m.submitCh <- &submitBlockMsg{blockHeader: bh, reply: reply}
err := <-reply
if err != nil {
log.WithFields(log.Fields{"err": err, "height": bh.Height}).Warning("submitWork failed")
}
return err
}
func (m *MiningPool) submitWork(bh *types.BlockHeader) error {
m.mutex.Lock()
defer m.mutex.Unlock()
if m.block == nil || bh.PreviousBlockHash != m.block.PreviousBlockHash {
return errors.New("pending mining block has been changed")
}
m.block.Nonce = bh.Nonce
m.block.Timestamp = bh.Timestamp
isOrphan, err := m.chain.ProcessBlock(m.block)
if err != nil {
return err
}
if isOrphan {
return errors.New("submit result is orphan")
}
if err := m.eventDispatcher.Post(event.NewMinedBlockEvent{Block: *m.block}); err != nil {
return err
}
return nil
}